Steam-boiler



W. ESTY.

STEAM BOILER.

(No Model.)

Patented 001;. 2'7, 1885.

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Witnesses:

N. PETERS. PnnmLimn n hnr. Washingfion. D. c.

NITED STATES ATENT OFFICE.

WILLIAM ESTY, OF LACONIA, NElV HAMPSHIRE.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 329,379, dated October 27, 1885.

Application filed July 27, 1885. Serial No. 172,770. (No model.)

To on whom it may concern Be it known that I, WILLIAM ESTY, of Laconia, in the county of Belknap and State of New Hampshire, have invented certain new and useful Improvements in Steam-Boilers, of which the following, taken in connection with the accompanying drawings, is aspecification.

My invention relates to the construction of tubular steam-boilers, and particularly to that class of such boilersin which the tubes are filled with water and surrounded by the fire; and it consists in a novel arrangement of the tubes within the fire-box, and in anovel construction of the fire-box and outer shell of the boiler, which will be best understood by reference to the description of the drawings, and to the claims to be hereinafter given.

Figure 1 of the drawings is a central vertical section of a boiler illustrating my invention. Fig. 2 is ahorizontal section of the same on line 00 a: on Fig. 1. Fig. 3 is a detail illustrating the manner of supporting the middle of the curved tubes from a straight tube. Fig. 4 is a section on line y 3/ on Fig. 3. Fig. 5 is a transverse section of one of the drop or pendent tubes, looking toward its lower end; and Fig. 6 is a central vertical section of the lower end of said tube. Figs. 3, 4, 5, and 6 are drawn to an enlarged scale.

In the drawings, A is the outer shell of the boiler, closed at its upper end by the hemispherical head A, and having secured therein,

near its lower end, the annular ribbed plate B by means of the conical-headed screw'bolts a, said plate having secured to its inner edge the short flanged cylinder 0, to the outer edge of which is riveted the cylindrical shell D, to the upper end of which is riveted the outer edge of the crown-sheet D, through the center of which opens the uptake or chimney E, which extends upward through the head or top plate, A, the inner edge of which is secured by the conical-headed screw-bolts b to the wroughtiron ring F, riveted to the exterior of the uptake E, as shown in Fig. 1.

G G are vertical tubes set in the annular horizontal portion of the plate 0 and the crown-sheet D, a short distance from the inner surface of the cylindrical shell D of the combustion-chamber, said tubes being arranged in a circle and equidistant from each other, except opposite the fire-door, where short drop or pendent tubes G are inserted in the crownsheet D, said tubes being closed at their lower ends, and each having inserted therein the circulating-tube G", havingits lowerend split and expanded to fit the interior of the tube G, as shown in Figs. 5 and 6. A wrought-iron rectangular frame, D, is riveted to the cylindrical shell D around the fire-door opening, and the outer shell is secured to said frame D by means of the conical-headed bolts a, all as shown in Fig. 1. A number of series of horizontal tubes are set in the upper portion of the cylindrical shell D of the fire-pot, one above the other, as shown in Fig. 1, each series consisting of one straight tube, 0, extending across the center of the fire-chamber, and two or more curved tubes, d d, upon each side of said straight tube, so arranged relatively to each other and said straight tube that their ends project through and are set in said cylindrical shell D as a tubesheet, at equal distances from each other, as shown in Fig. 2. The different series of horizontal tubes are so arranged relatively to each other that the straight tube of one series extends across the combustion-chamber in a plane at right angles to the straight tube in the next series above or below it, and the openings of said tubes through the sheet D are arranged one above the other, or in vertical rows, so as to leave clear spaces between the horizontal tubes for the passage between them of the vertical tubes G and G, as clearly shown in Figs. 1 and 2. The curved horizontal tubes d d are each supported at the middle'of their lengths by means of double connecting-rings e 0 with a straight tube, 0, above or below it, as shown in Figs. 3 and 4.

H is the ash-pit; H, the ash-pit door, and I the fire-door.

J is the grate, supported upon a series of bolt-heads, f, projecting inward from the inner edge of the annular plate B, as shown in Fig. 2. A perforated annular plate, L, is riveted to the head A above its junction with the shell A, said plate having an inner diameter somewhat larger than the exterior diameter of the ring F, and resting at its inner edge upon the smaller perforated plate, L, riveted to the upper plate, E, as shown in Fig. 1. The object of this construction of the perforated plate L L is to render it practical to remove the outer shell of the boiler by removing the bolts a and 1) whenever it becomes necessary to repair or replace the tubes G, c, or d, which is one of the advantages of my invention.

Another advantage obtained by my invention is a very material increase in the heatingsurface without increasing the size of the boiler.

What I claim as new, and desire to secure by Letters Patent of the United States, is-

1. In combination with a cylindrical combustion-chamber of a steam-boiler, a series of vertical tubes and one or more series of horizontal tubes all extending across or through said combustion-chamber and communicating at each end with the water-chamber, substantially as described.

2. In combination with a cylindrical combustion-chamber of a steam-boiler, one or more series of horizontal tubes extending across said chambers, each of said series consisting of one straight tube and two or more curved tubes upon each'side of said straight tube, all communicating at each end with the water-chamber, substantially as described.

3. In combination with a cylindrical combustion-chamber of a steam-boiler, a series of vertical tubes extending across said chamber from top to bottom, near its inclosingwall, and one or more series of horizontal tubes extending across said chamber, each of said horizontal series consisting of one straight tube and two or more curved tubes upon each side of said straight tube, all communicatingat each end with the water-chamber, substantially as described.

4. I11 combination with a cylindrical combustion-chamber of a steam-boiler and vertical and horizontal tubes extending across said chamber and communicating with the waterspace surrounding said combustion-chamber, the outer shell of the boiler secured to the inner portions of the boiler by screw-bolts, substantially as and for the purposes described.

5. In combination with a cylindrical combustion-chamber of a steam-boiler, one or more series of horizontal tubes extending across said chamber, all the tubes in each series being arranged in the same horizontal plane'and opening at each end through the shell of said chamber in directions radial to its axis or center, substantially as shown and described.

6. In an upright steam-boiler provided with a cylindrical combustion -chamber, one or more series of curved tubes extending horizontally, or nearly so, across the combustionchamber and passing in a radial direction through the cylindrical wall thereof, substantially as described.

In testimony whereof I have signed my name to this specification, in the'presence of two subscribing witnesses, on this 18th day of June, A. D. 1885. I

WILLIAM ESTY.

Witnesses:

WALTER E. LOMBARD, Gno. E. MITCHELL. 

